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Theory:

Features of covalent compounds:
As previously stated, the nature of bonding between constituent atoms determines the properties of compounds. As a result, covalently bound chemicals differ from ionic compounds in terms of their properties.
Physical state:
 
The bond can be weaker or stronger depending on the force of attraction between covalent molecules. As a result, covalent compounds exist in three states: gaseous, liquid, and solid. For example, oxygen-gas, water-liquid, and diamond-solid.
 
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Electrical conductivity:
 
Covalent compounds are poor conductors of electricity because they lack charged particles (ions).
 
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Electrical conductivity  
 
Melting point:
 
They have more moderate melting points than ionic compounds, except for a few covalent compounds (Diamond, Silicon carbide).
 
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Diamond melting
  
Solubility:
 
Benzene and other non-polar solvents make covalent compounds soluble. They are insoluble in water and polar solvents.
 
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Covalent compounds soluble  
 
Density, hardness and brittleness:
 
Hardness and brittleness are not characteristics of covalent compounds. Instead, they are soft and waxy.
 
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Covalent compounds are like wax  
 
Reactions:
 
In solutions, covalent compounds undergo slow molecular reactions.